An anonymous user, quoted by 9to5Mac, made an unusual discovery by accessing accessibility options on the iOS 7.
iOS 7 allows you to use your iPhone or iPad using only your head.
A head movement to the left activates a function, while a head movement to the right activates another.
These functions are rather reserved for people with disabilities who have difficulty to use the screen via conventional controls.
A left or right head movement can act as a home button, start Siri, open Notification Center, open the App Switcher, decrease volume, increase volume, or a simple tap.